Function avfilter_graph_create_filter 

pub unsafe extern "C" fn avfilter_graph_create_filter(
    filt_ctx: *mut *mut AVFilterContext,
    filt: *const AVFilter,
    name: *const c_char,
    args: *const c_char,
    opaque: *mut c_void,
    graph_ctx: *mut AVFilterGraph,
) -> c_int